I hope we get some form of conclusion to that at some point - Illidan at least is still out there but serious shame about Kael'thas and Vash'j they really deserved better. There's a reason TBC isn't very high on my expansion list like most.
I always viewed him as a bit of both. An asshole anti-hero. I think his destroying X'era was the best showcasing of that. Was really happy his rejecting of X'era and his line of, "There can be no chosen one." cause man the chosen one trope sucks.